// Chapter 7
// Glossary terms for chapter 7
xBookUtils.terms['Cohens'] = 'Cohen’s d a standardized measure of effect used to measure the difference between means.';
xBookUtils.terms['critical value of t'] = 'critical value of t value of t used to determine whether a null hypothesis is rejected or not; abbreviated tcv.';
xBookUtils.terms['degrees of freedom'] = 'degrees of freedom (df) the number of values in a sample that are free to vary.';
xBookUtils.terms['effect size'] = 'effect size (d) a measure of the degree of impact of the independent variable on the dependent variable.';
xBookUtils.terms['replicate'] = 'replicate to repeat a study, usually introducing some change in procedure to make it better.';
xBookUtils.terms['r2'] = 'r2 an effect size that calculates how much of the variability in the outcome variable is accounted for by the predictor variable.';
xBookUtils.terms['single-sample t test'] = 'single-sample t test a statistical test that compares a sample mean to a population mean when the population standard deviation is not known.';
xBookUtils.terms['underpowered'] = 'underpowered term for a study with a sample size too small for the study to have a reasonable chance to reject the null hypothesis given the size of the effect.';